Researchers have recently found a connection between disease and stressful situations. To

第1题

______enough time and money, the researchers would have been able to discover more in this

field.

A．Giving

B．To give

C．Given

D．Being given

点击查看答案

第2题

Researchers have found that REM（rapid eye movement)sleep is important to human beings. Thi

Researchers have found that REM(rapid eye movement)sleep is important to human beings. This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence. The deeper a persons sleep becomes, the longer the periods of rapid eye movement. There are physical changes in the body to show that a person has changed from NREM(non-rapid eye movement)to REM sleep. Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly. Accompanying these physical changes in the body there is a very important characteristic of REM sleep. It is during REM sleep that a person dreams.

According to the passage, how often does REM sleep occur in one night？

A．Once.

B．Twice.

C．Four or five times.

D．Forty times.

点击查看答案

第3题

Humans have always been fascinated by dreams. The vivid dreams people remember and talk ab

out are REM dream—the type that occur almost continuously during periods of rapid eye movement (REM) during sleep. But people also have NREM dreams—dreams that occur during periods without rapid eye movement called NREM sleep—although they are typically less frequent and less memorable than REM dreams. REM dreams have a story like or dream like quality and are more visual, vivid, and emotional than NREM dreams. Interestingly, blind people who lose their sight before age five usually do not have visual dreams, but they have vivid dreams involving the other senses. A popular belief about dreams is that an entire dream takes place in an instant, but in fact, it is not true. Sleep researchers have discovered that it takes about as long to dream a dream as it would to experience the same thing in real life.

Although some people insist that they do not dream at all, researchers say that all people dream unless they consume alcohol or take drugs that suppress REM sleep. Are dreaming and REM sleep essentially one and the same？ Some researchers have questioned an assumption

long held by some sleep experts that dreaming is simply the brain's effort to make sense of the random firing of neurons that occurs during REM sleep. Are the brain mechanisms responsible for REM sleep the same ones that create the rich dream world we experience？ The answer may be no. It is known that dreams do occur outside of REM sleep. Moreover, the REM state can exist without dreams. These two facts suggest that different but complementary brain mechanisms are responsible for REM sleep and the dreaming that normally occurs within it. There is mounting evidence, says British researcher Mark Solms, that dreaming and REM sleep, while normally occurring together, are not one and the same. Rather, the REM state is controlled by neural mechanisms in the brain stem, while areas farther up in the forebrain provide the common pathway that gives us the complex and often vivid mental experiences we call dreams.

Other researchers suggest that REM sleep aids in information processing, helping people sift through daily experience to organize and store in memory information that is relevant to them. Animal studies provide strong evidence for a relationship between REM sleep and learning. Some studies have revealed that animals increase their REM sleep following learning sessions. Other studies have indicated that when animals are deprived of REM sleep after new learning, their performance of the learned task is impaired the following day. But depriving subjects of NREM sleep had no such effect in the studies.

Research has shown that REM sleep serves an information-processing function in humans and is involved in the consolidation of memories after human learning. Researchers found that research participants learning a new perceptual skill showed an improvement in performance, with no additional practice, eight to ten hours later if they had a normal night's sleep or if the researchers disturbed only their NREM sleep. Performance did not improve, however, in those who were deprived of REM sleep.

There is no doubt that REM sleep serves an important function, even if psychologists do not know precisely what that function is. The fact that newborns have such a high percentage of REM sleep has led to the conclusion that REM sleep is necessary for maturation of the brain in infants. Furthermore, when people are deprived of REM sleep as a result of general sleep loss or illness, they will make up for the loss by getting an increased amount of REM sleep after the deprivation. This increase in the percentage of REM sleep to make up for REM deprivation is called a "REM rebound." Because the intensity of REM sleep is increased during a REM rebound, nightmares often occur.

Why does the author state "The answer may be no" in paragraph 2？

A．To introduce a theory that REM sleep and dreams are not necessarily connected.

B．To contrast dreaming before and after REM sleep.

C．To explain why dreaming and REM sleep are essentially the same.

D．To suggest that more dreams occur inside REM sleep than outside it.

点击查看答案

第4题

A flexible work life such as telecommuting, is good for your health, researchers said. The

y found that if people have the ability to work from home and to compress work weeks, they are more likely to make healthier lifestyle. choices, to exercise more and to sleep better.

While the primary driver behind the flexibility movement was to help people, especially women, combine work and family, evidence suggests this is clearly not only a women's issue, Grzywacz, who reported the findings in the Journal of Occupational and Environmental Medicine, said.

The researchers looked at Health Risk Appraisals from employees in jobs ranging from warehouse and production workers to executives at a large multinational pharmaceutical company.

The firm used for the study is consistently recognized by Working Mother magazine as among the most family-friendly employers in the United States.

He said the research shows public health departments and organizations that they could get something out of giving their employees more flexibility.

点击查看答案

第5题

Ruth Simmons joined Goldman Sachs's board as an outside director in January 2000; a year l

ater she became president of Brown University. For the rest of the decade she apparently managed both roles without attracting much criticism. But by the end of 2009 Ms. Simmons was under fire for having sat on Goldman's compensation committee; how could she have let those enormous bonus payouts pass unremarked？ By February the next year Ms. Simmons had left the board. The position was just taking up too much time, she said.

Outside directors are supposed to serve as helpful, yet less biased, advisers on a firm's board. Having made their wealth and their reputations elsewhere, they presumably have enough independence to disagree with the chief executive's proposals. If the sky, and the share price, is falling, outside directors should be able to give advice based on having weathered their own crises.

The researchers from Ohio University used a database that covered more than 10, 000 firms and more than 64, 000 different directors between 1989 and 2004. Then they simply checked which directors stayed from one proxy statement to the next. The most likely reason for departing a board was age, so the researchers concentrated on those "surprise" disappearances by directors under the age of 70. They found that after a surprise departure, the probability that the company will subsequently have to restate earnings increases by nearly 20% . The likelihood of being named in a federal class-action lawsuit also increases, and the stock is likely to perform. worse. The effect tended to be larger for larger firms. Although a correlation between them leaving and subsequent bad performance at the firm is suggestive, it does not mean that such directors are always jumping off a sinking ship. Often they "trade up, " leaving riskier, smaller firms for larger and more stable firms.

But the researchers believe that outside directors have an easier time of avoiding a blow to their reputations if they leave a firm before bad news breaks, even if a review of history shows they were on the board at the time any wrongdoing occurred. Firms who want to keep their outside directors through tough times may have to create incentives. Otherwise outside directors will follow the example of Ms. Simmons, once again very popular on campus.

According to Paragraph 1, Ms. Simmons was criticized for_________.

A．gaining excessive profits

B．failing to fulfill her duty

C．refusing to make compromises

D．leaving the board in tough times

点击查看答案

第6题

Data sharing: an open mind on open date[ A] It is a movement building steady momentum: a c

Data sharing: an open mind on open date

[ A] It is a movement building steady momentum: a call to make research data, software code and experimental methods publicly available and transparent. a spirit of openness is gaining acceptance in the science community, and is the only way, say advocates, to address a&39;crisis&39; incience whereby too few findings are successfully reproduced. furthermore, they say, it is the best way for researchers to gather the range of observations that are necessary to speed up discoveries or to identify large-scale trends.

[B] the open-data shift poses a confusing problem for junior researchers. on the one hand,the drive to share is gathering official steam. since 2013, global scientific bodies have begun to back politics that support increased public access to reseach.on the other hand,scientists disagree about how much and when they should share date,and they debate whether sharing it is more likely to accelerate science and make it more robust, or to introduce vulnerabilities and problems.as more journals and make it more robust,or to introduce vulnerabilities and problems.as more journal and funders adopt data-sharing requirements, and as a growing number of enthusiasts call for more openness, junior researchers must find their place between adopters and those who continue to hold out, even as they strive to launch their own careers.

[C] one key challenge facing young scientists is how to be open without becoming scientifically vulnerable. they must determine the risk of jeopardizing a job offer or a collaboration prosal from those who are wary of-or unfamiliar with -open science. and they must learn How to capitalize on the movement&39;s benefits such as opportunities for more citations and a way to build a reputation without the need for conventional metrics, such as publication in high-impact journals.

[D] some fields have embraced open data more than others. researchers in psychology, a field rocked by findings of irreproducibility in the past few years, have been especially vocal sup-porters of the drive for more-open science.A few psychology journals have created incentives to increase interest in repar open science. a few psychology journals have created incentives porters of the drive for me lucible science -for example, by affixing an",badge to articles that clearly state where data are available. according to social psychologist brian nose executive director of the center for open science, the average data-sharing rate for the journal Psychological science, which uses the badges, increased tenfold to 38% from 2013 to 2015.

[E] funders, too, are increasingly adopting an open-data policy .several strongly ergement,and some require,a date-management plan that makes data available .The us national science foundation is among these, some philanthropic (慈善的) funders, including the bill Gates foundation in seattle, washington, and the wellcome trust in london, alopen data from their grant recipients.

[F] but many young researchers, especially those who have not been mentored in open science .are uncertain about whether to share or to stay private.Graduate students and postdoes,who often are working on their lab head&39;s grant may have no choice if their supervisor or another senior opposes sharing.

[G] some fear that the potential impact of sharing is too high, especially at the early stages of a career." Everybody has a scary story about someone getting scooped(被抢先),” says new York university astronomer david hogg. those fears may be a factor in a lingering hesitation to share data even when publishing in journals that mandate it.

[H] researchers at small labs or at institutions focused on teaching arguably have the most to lose when sharing hard-won data. ""with my institution and teaching load, i don&39;t have postdocs and grad students", says terry mcglynn, a tropical biologist at california state university,Dominguez hills. "the stakes are higher to share data because it&39;s a bigger fraction of hats happening in my lab.

[I] researchers also point to the time sink that is involved in preparing data for others to view.Once the data and associated materials appear in a repository(存储库 ), answering questions and handling complaints can take many hours.

[J] the time investment can present other problems. in some cases, says data scientist karthik Ram, it may be difficult for junior researchers to embrace openness when senior colleagues many of whom head selection and promotion teesht ridicule what they may view as misplaced energies. "i&39;ve heard this recently -that embracing the idea of open datad code makes traditional academics uncomfortable, "says ram. "the concem seems to be that open advocates don&39;t spend their time being as productive as possible."

[ K]an open-science stance can also add complexity to a collaboration. kate ratliff, who studies social attitudes at the university of florida, gainesville, says that it can seem as if there are two camps in a field-those who care about open science and those who don&39;t . " there a new area to navigate-&39;are you cool with the fact that i&39;ll want to make the data open？&39;-when talking with somebody about an interesting research idea, "she says.

[L] despite complications and concerns, the upsides of sharing can be significant. for example,when information is uploaded to a repository, a digital object identifier(DOI)is assigned.

Scientists can use a DOT to publish each step of the research life cycle, not just the final paper. In so doing, they can potentially get three citations- one each for the data and software.in addition to the paper itself. and although some say that citations for software or data have little currency in academia,they can have other benefits.

[M] many advocates think that transparent data procedures with a date and time stamp will protect scientists from being scooped. "this is the sweet spot between sharing and getting credit for it. while discouraging plagiarism(剽窃). " says ivo grigorov, a project coordinator at the naional institute of aquatic resot

Research secreta - in charlottenlund, denmark. hogg says that scooping is less of a problem than many think. "the two cases i&39;m familiar with didn&39;t involve open data or code, "he says.

[N] Open science also offers junior researchers the chance to level the palying field by gaining better access to crucial date. ross mounce, a postdoc studying evolutionary biology at the university of cambrige,UK, is a vocal champion of open science, partly because his fossil others&39; data. he says that more openness in science could help to discourage what some perceive as a commom practice of shutting out early-career scientists&39; requests for data.

[O] communication also helps for those who worry about jeopardizing a collaboration, he says,Concems about open should be discussed at the outset of a study. "whenever you start a project with someone, you have to establish a clear understanding of expectations for who owns the data, at what point they go public and who can do what with them, he says.

[p] in the end, sharing data, software and materials with colleagues can help an early -career researcher to gain recognition--a crucial component of success. "the thing you are searching for reputation" says titus brown,a genomics(基因组学) researcher at the university of Califomia, davis,."to get grants and jobs you have to be relevant and achieve some level of public recognition. anything you do that advances your presence- especially in a larger

phere, outside the communities you know- is a net win."

36. astronomer david hogg doesn&39;t think scooping is as serious a problem as generally thought.

37. some researchers are hesitant to make their data public for fear that others might publish something similar before them

38. some psychology joumals have offered incentives to encourage authors to share their data.

39. there is a growing demand in the science community that research data be open to the public.40. sharing data offers early-career researchers the chance to build a certain level of reputation

41. data sharing enables scientists to publish each step of their research work, thus leading to more citations

42. scientists hold different opinions about the extent and timing of data sharing

43. potential problems related to data sharing should be made known to and discussed by all participants at the beginning of a joint research project

44. sharing data and handling data-related issues can be time-consuming

45. junior researehers may have no say when it comes to sharing data.

点击查看答案

第7题

Water is necessary for life and good health. We often forget this fact when we think about

the other building blocks of life, such as vitamins, minerals and proteins. We can live for many days without eating. However, only two or three days without water usually leads to death.

The human body may look solid, but most of it is water. New-born babies are as much as eighty-five percent water. Women are about sixty five percent water, and men about seventy-five percent. Women usually have less water than men because women, in general, have more fat cells. Fat cells hold less water than other kinds of cells.

Water is necessary for cooling the body on hot days, and when we are working hard or exercising. Water carries body heat to the surface of the skin when the heat is lost through perspiration.

Researchers note that fat cells block body heat from escaping quickly. Fat cells under the skin act like warm clothing to keep body heat inside. This is why over-weight people have a more difficult time staying cool than thin people.

Researchers also note that cold liquids cool us faster than warm liquids. This is because cold liquids take up more heat inside the body and carry it away faster. They say, however, that cold sweet drinks do not work well. The sugar slows the liquid from getting into the bloodstream.

The body loses water every day through perspiration and urine. If we lose too much, we will become sick. To replace what is lost, health experts say grown persons should drink about two liters of liquids each day, and more in hot weather. They say we also can get some of the water we need in the foods we eat. Most fruits and vegetables have more than eighty percent water. Even bread has about thirty-three percent water.

From the passage we learn that among the following four groups of people _______.

A．fat women are over eighty percent water

B．thin men are never eighty percent water

C．new-born infants are over eighty percent water

D．elderly adults are over eighty percent water

点击查看答案

第8题

In his book The Tipping Point, Malcolm Gladwell argues that " social epidemics" are driven in large part by the actions of a tiny minority of special individuals, often called influential, who are unusually informed, persuasive, or well-connected. The idea is intuitively compelling, but it doesn't explain how ideas actually spread.

The supposed importance of influentials derives from a plausible-sounding but largely untested theory called the "two-step flow of communication" : Information flows from the media to the influentials and from them to everyone else. Marketers have embraced the two-step flow because it suggests that if they can just find and influence the influentials, those select people will do most of the work for them. The theory also seems to explain the sudden and unexpected popularity of certain looks, brands, or neighborhoods. In many such cases, a cursory search for causes finds that some small group of people was wearing, promoting, or developing whatever it is before anyone else paid attention. Anecdotal evidence of this kind fits nicely with the idea that only certain special people can drive trends.

In their recent work, however, some researchers have come up with the finding that influentials have far less impact on social epidemics than is generally supposed. In fact, they don't seem to be required at all.

The researchers' argument stems from a simple observation about social influence: With the exception of a few celebrities like Oprah Winfrey—whose outsize presence is primarily a function of media, not interpersonal, influence—even the most influential members of a population simply don' t interact with that many others. Yet it is precisely these non-celebrity influentials who, according to the two-step-flow theory, are supposed to drive social epidemics, by influencing their friends and colleagues directly. For a social epidemic to occur, however, each person so affected must then influence his or her own acquaintances, who must in turn influence theirs, and so on; and just how many others pay attention to each of these people has little to do with the initial influential. If people in the network just two degrees removed from the initial influential prove resistant, for example, the cascade of change won't propagate very far or affect many people.

Building on the basic truth about interpersonal influence, the researchers studied the dynamics of social influence by conducting thousands of computer simulations of populations, manipulating a number of variables relating to people's ability to influence others and their tendency to be influenced. They found that the principal requirement for what is called "global cascades"—the widespread propagation of influence through networks—is the presence not of a few influentials but, rather, of a critical mass of easily influenced people.

By citing the book The Tipping Point, the author intends to （）.

A.analyze the consequences of social epidemics.

B.discuss influentials' function in spreading ideas.

C.exemplify people' s intuitive response to social epidemics.

D.describe the essential characteristics of influentials.

点击查看答案

第9题

Robots May Allow Surgery in Space Small robots designed by University of Nebraska research

Robots May Allow Surgery in Space

Small robots designed by University of Nebraska researchers may allow doctors on Earth to help perform. surgery on patients in space.

The tiny, wheeled robots, （51）are about 3 inches tall and as wide as a lipstick case, can be slipped into small incisions(切口)and computer-controlled by surgeons in different locations. Some robots are equipped（52）cameras and lights and can send images back to surgeons and others have surgical tools attached that can be（53）remotely.

“We think this is going to （54）open surgery, ”Dr Dmitry Oleynikov said at a news conference. Oleynikov is a （55）in computer-assisted surgery at the University of Nebraska Medical Center in Omaha.

Officials hope that NASA will teach（56）to use the robots soon enough so that surgeries could one day be performed in space.

On earth, the surgeons could control the robots themselves（57）other locations. For example, the robots could enable surgeons in other places to （58）on injured soldiers on the front line. Researchers plan tp seek federal regulatory（59）early nest year. Tests on animals have been successful, and tests on humans in England will begin very soon.

The camera-carrying robots can provide（60）of affected areas and the ones with surgical tools will be able to maneuver(操控)inside the body in ways surgeons' hands can't. The views from the camera-carrying robots are （61）than the naked eye, because they（62）back color images that are magnified(放大). Because several robots can be inserted through one incision, they could reduce the amount and （63）of cuts needed for surgery, which would decrease recovery time. This is particularly（64）to those patients who have been debilitated(使虚弱)by long illness.

Eventually, Oleynikov said, the tiny robots may enable surgeons to work without ever（65）their hands in patients' bodies. “That's the goal, ”Oleynikov said. “It's getting easier and easier. We can do even more with these devices. ”

A．since

B．when

C．which

D．as

点击查看答案

第10题

A new study uses advanced brain-scanning technology to cast light onto a topic that 【M1】__

____

psychologists have puzzled over more than half a century: social conformity. The study 【M2】______

was based on a famous series of laboratory experiment from the 1950's by a social psy 【M3】______

chologist, Dr. Solomon Asch. In those early studies, the subjects were shown two cards.

On the first was a vertical line. On the second were three lines, one of them the same length

with that on the first card. Then the subjects were asked to say which two lines were 【M4】______

like, something that most 5-year-olds could answer correctly. But Dr. Asch added a twist. 【M5】______

Seven other people, in cahoots with the researchers, also examined the lines and gave

their answers before the subjects did. And sometimes these confederates unconsciously 【M6】______

gave the wrong answer. Dr. Asch was astonished at what happened next.. After thinking 【M7】______

hard, three out of four subjects agreed with the incorrect answers given by the confederates 【M8】______

at least once. And one in four conformed 50 percent of the time. Dr. Asch, who died

in 1996, always wondered about the findings. Did the people who gave in to group do so

knowing that their answers was right？ Or did the social pressure actually change their

perceptions？ The researchers found that social conformity showed up in the brain like 【M9】______

activity in regions that are entirely devoted to perception. But independence of judgment

m standing up for one' s beliefs M showed up as activity in brain areas involved in emotion,

the study found, suggesting that there be a cost for going against the group. 【M10】______

【M1】

点击查看答案